443 lines
15 KiB
Java
443 lines
15 KiB
Java
package org.grapheneos.pdfviewer;
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import android.annotation.SuppressLint;
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import android.app.Activity;
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import android.content.Intent;
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import android.content.res.ColorStateList;
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import android.graphics.Color;
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import android.net.Uri;
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import android.os.Bundle;
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import android.util.Log;
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import android.view.Gravity;
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import android.view.Menu;
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import android.view.MenuInflater;
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import android.view.MenuItem;
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import android.webkit.CookieManager;
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import android.webkit.JavascriptInterface;
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import android.webkit.WebResourceRequest;
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import android.webkit.WebResourceResponse;
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import android.webkit.WebSettings;
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import android.webkit.WebView;
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import android.webkit.WebViewClient;
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import android.widget.TextView;
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import android.widget.Toast;
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import androidx.appcompat.app.AppCompatActivity;
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import androidx.loader.app.LoaderManager;
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import androidx.loader.content.Loader;
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import java.io.IOException;
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import java.io.InputStream;
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import java.util.ArrayList;
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import java.util.HashMap;
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import java.util.List;
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import org.grapheneos.pdfviewer.fragment.DocumentPropertiesFragment;
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import org.grapheneos.pdfviewer.fragment.JumpToPageFragment;
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import org.grapheneos.pdfviewer.loader.DocumentPropertiesLoader;
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public class PdfViewer extends AppCompatActivity implements LoaderManager.LoaderCallbacks<List<CharSequence>> {
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public static final String TAG = "PdfViewer";
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private static final String STATE_URI = "uri";
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private static final String STATE_PAGE = "page";
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private static final String STATE_ZOOM_LEVEL = "zoomLevel";
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private static final String KEY_PROPERTIES = "properties";
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private static final String CONTENT_SECURITY_POLICY =
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"default-src 'none'; " +
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"form-action 'none'; " +
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"connect-src https://localhost/placeholder.pdf; " +
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"img-src blob: 'self'; " +
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"script-src 'self'; " +
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"style-src 'self'; " +
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"frame-ancestors 'none'; " +
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"base-uri 'none'";
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private static final String FEATURE_POLICY =
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"accelerometer 'none'; " +
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"ambient-light-sensor 'none'; " +
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"autoplay 'none'; " +
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"camera 'none'; " +
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"encrypted-media 'none'; " +
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"fullscreen 'none'; " +
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"geolocation 'none'; " +
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"gyroscope 'none'; " +
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"magnetometer 'none'; " +
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"microphone 'none'; " +
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"midi 'none'; " +
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"payment 'none'; " +
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"picture-in-picture 'none'; " +
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"speaker 'none'; " +
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"sync-xhr 'none'; " +
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"usb 'none'; " +
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"vr 'none'";
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private static final int MIN_ZOOM_LEVEL = 0;
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private static final int MAX_ZOOM_LEVEL = 4;
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private static final int ALPHA_LOW = 130;
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private static final int ALPHA_HIGH = 255;
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private static final int ACTION_OPEN_DOCUMENT_REQUEST_CODE = 1;
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private static final int STATE_LOADED = 1;
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private static final int STATE_END = 2;
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private static final int PADDING = 10;
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private Uri mUri;
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public int mPage;
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public int mNumPages;
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private int mZoomLevel = 2;
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private int mDocumentState;
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private List<CharSequence> mDocumentProperties;
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private InputStream mInputStream;
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private WebView mWebView;
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private TextView mTextView;
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private Toast mToast;
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private class Channel {
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@JavascriptInterface
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public int getPage() {
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return mPage;
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}
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@JavascriptInterface
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public int getZoomLevel() {
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return mZoomLevel;
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}
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@JavascriptInterface
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public void setNumPages(int numPages) {
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mNumPages = numPages;
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}
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@JavascriptInterface
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public void setDocumentProperties(final String properties) {
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if (mDocumentProperties != null) {
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throw new SecurityException("mDocumentProperties not null");
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}
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final Bundle args = new Bundle();
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args.putString(KEY_PROPERTIES, properties);
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runOnUiThread(() -> {
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LoaderManager.getInstance(PdfViewer.this).restartLoader(DocumentPropertiesLoader.ID, args, PdfViewer.this);
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});
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}
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}
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// Can be removed once minSdkVersion >= 26
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@SuppressWarnings("deprecation")
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private void disableSaveFormData(final WebSettings settings) {
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settings.setSaveFormData(false);
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}
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@Override
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@SuppressLint("SetJavaScriptEnabled")
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protected void onCreate(Bundle savedInstanceState) {
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super.onCreate(savedInstanceState);
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setContentView(R.layout.webview);
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mWebView = findViewById(R.id.webview);
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final WebSettings settings = mWebView.getSettings();
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settings.setAllowContentAccess(false);
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settings.setAllowFileAccess(false);
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settings.setCacheMode(WebSettings.LOAD_NO_CACHE);
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settings.setJavaScriptEnabled(true);
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disableSaveFormData(settings);
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CookieManager.getInstance().setAcceptCookie(false);
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mWebView.addJavascriptInterface(new Channel(), "channel");
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mWebView.setWebViewClient(new WebViewClient() {
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private WebResourceResponse fromAsset(final String mime, final String path) {
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try {
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InputStream inputStream = getAssets().open(path.substring(1));
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return new WebResourceResponse(mime, null, inputStream);
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} catch (IOException e) {
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return null;
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}
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}
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@Override
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public WebResourceResponse shouldInterceptRequest(WebView view, WebResourceRequest request) {
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if (!"GET".equals(request.getMethod())) {
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return null;
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}
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final Uri url = request.getUrl();
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if (!"localhost".equals(url.getHost())) {
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return null;
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}
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final String path = url.getPath();
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Log.d(TAG, "path " + path);
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if ("/placeholder.pdf".equals(path)) {
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return new WebResourceResponse("application/pdf", null, mInputStream);
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}
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if ("/viewer.html".equals(path)) {
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final WebResourceResponse response = fromAsset("text/html", path);
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HashMap<String, String> headers = new HashMap<String, String>();
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headers.put("Content-Security-Policy", CONTENT_SECURITY_POLICY);
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headers.put("Feature-Policy", FEATURE_POLICY);
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response.setResponseHeaders(headers);
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return response;
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}
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if ("/viewer.css".equals(path)) {
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return fromAsset("text/css", path);
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}
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if ("/viewer.js".equals(path)) {
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return fromAsset("application/javascript", path);
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}
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if ("/pdf.js".equals(path)) {
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return fromAsset("application/javascript", path);
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}
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if ("/pdf.worker.js".equals(path)) {
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return fromAsset("application/javascript", path);
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}
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return null;
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}
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@Override
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public boolean shouldOverrideUrlLoading(WebView view, WebResourceRequest request) {
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return true;
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}
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@Override
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public void onPageFinished(WebView view, String url) {
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mDocumentState = STATE_LOADED;
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invalidateOptionsMenu();
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}
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});
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mTextView = new TextView(this);
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mTextView.setBackgroundColor(Color.DKGRAY);
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mTextView.setTextColor(ColorStateList.valueOf(Color.WHITE));
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mTextView.setTextSize(18);
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mTextView.setPadding(PADDING, 0, PADDING, 0);
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// If loaders are not being initialized in onCreate(), the result will not be delivered
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// after orientation change (See FragmentHostCallback), thus initialize the
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// loader manager impl so that the result will be delivered.
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LoaderManager.getInstance(this);
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final Intent intent = getIntent();
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if (Intent.ACTION_VIEW.equals(intent.getAction())) {
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if (!"application/pdf".equals(intent.getType())) {
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Log.e(TAG, "invalid mime type");
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finish();
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return;
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}
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mUri = intent.getData();
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mPage = 1;
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}
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if (savedInstanceState != null) {
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mUri = savedInstanceState.getParcelable(STATE_URI);
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mPage = savedInstanceState.getInt(STATE_PAGE);
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mZoomLevel = savedInstanceState.getInt(STATE_ZOOM_LEVEL);
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}
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if (mUri != null) {
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loadPdf();
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}
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}
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@Override
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public Loader<List<CharSequence>> onCreateLoader(int id, Bundle args) {
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return new DocumentPropertiesLoader(this, args.getString(KEY_PROPERTIES), mNumPages, mUri);
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}
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@Override
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public void onLoadFinished(Loader<List<CharSequence>> loader, List<CharSequence> data) {
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mDocumentProperties = data;
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LoaderManager.getInstance(this).destroyLoader(DocumentPropertiesLoader.ID);
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}
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@Override
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public void onLoaderReset(Loader<List<CharSequence>> loader) {
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mDocumentProperties = null;
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}
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private void loadPdf() {
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try {
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if (mInputStream != null) {
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mInputStream.close();
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}
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mInputStream = getContentResolver().openInputStream(mUri);
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} catch (IOException e) {
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return;
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}
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mWebView.loadUrl("https://localhost/viewer.html");
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}
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private void renderPage(final boolean lazy) {
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mWebView.evaluateJavascript(lazy ? "onRenderPage(true)" : "onRenderPage(false)", null);
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}
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private void openDocument() {
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Intent intent = new Intent(Intent.ACTION_OPEN_DOCUMENT);
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intent.addCategory(Intent.CATEGORY_OPENABLE);
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intent.setType("application/pdf");
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startActivityForResult(intent, ACTION_OPEN_DOCUMENT_REQUEST_CODE);
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}
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private static void enableDisableMenuItem(MenuItem item, boolean enable) {
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if (enable) {
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if (!item.isEnabled()) {
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item.setEnabled(true);
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item.getIcon().setAlpha(ALPHA_HIGH);
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}
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} else if (item.isEnabled()) {
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item.setEnabled(false);
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item.getIcon().setAlpha(ALPHA_LOW);
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}
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}
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public void onJumpToPageInDocument(int selected_page) {
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if (selected_page >= 1 && selected_page <= mNumPages) {
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mPage = selected_page;
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renderPage(false);
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showPageNumber();
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}
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}
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@Override
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public void onSaveInstanceState(Bundle savedInstanceState) {
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super.onSaveInstanceState(savedInstanceState);
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savedInstanceState.putParcelable(STATE_URI, mUri);
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savedInstanceState.putInt(STATE_PAGE, mPage);
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savedInstanceState.putInt(STATE_ZOOM_LEVEL, mZoomLevel);
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}
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@Override
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protected void onActivityResult(int requestCode, int resultCode, Intent resultData) {
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if (requestCode == ACTION_OPEN_DOCUMENT_REQUEST_CODE && resultCode == Activity.RESULT_OK) {
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if (resultData != null) {
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mUri = resultData.getData();
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mPage = 1;
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mDocumentProperties = null;
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loadPdf();
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invalidateOptionsMenu();
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}
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}
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}
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private void showPageNumber() {
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if (mToast != null) {
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mToast.cancel();
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}
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mTextView.setText(String.format("%s/%s", mPage, mNumPages));
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mToast = new Toast(getApplicationContext());
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mToast.setGravity(Gravity.BOTTOM | Gravity.END, PADDING, PADDING);
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mToast.setDuration(Toast.LENGTH_SHORT);
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mToast.setView(mTextView);
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mToast.show();
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}
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@Override
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public boolean onCreateOptionsMenu(Menu menu) {
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super.onCreateOptionsMenu(menu);
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MenuInflater inflater = getMenuInflater();
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inflater.inflate(R.menu.pdf_viewer, menu);
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return true;
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}
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@Override
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public boolean onPrepareOptionsMenu(Menu menu) {
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final int ids[] = { R.id.action_zoom_in, R.id.action_zoom_out, R.id.action_jump_to_page,
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R.id.action_next, R.id.action_previous, R.id.action_view_document_properties };
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if (mDocumentState < STATE_LOADED) {
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for (final int id : ids) {
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final MenuItem item = menu.findItem(id);
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if (item.isVisible()) {
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item.setVisible(false);
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}
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}
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} else if (mDocumentState == STATE_LOADED) {
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for (final int id : ids) {
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final MenuItem item = menu.findItem(id);
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if (!item.isVisible()) {
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item.setVisible(true);
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}
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}
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mDocumentState = STATE_END;
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}
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switch (mZoomLevel) {
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case MAX_ZOOM_LEVEL:
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enableDisableMenuItem(menu.findItem(R.id.action_zoom_in), false);
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return true;
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case MIN_ZOOM_LEVEL:
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enableDisableMenuItem(menu.findItem(R.id.action_zoom_out), false);
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return true;
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default:
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enableDisableMenuItem(menu.findItem(R.id.action_zoom_in), true);
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enableDisableMenuItem(menu.findItem(R.id.action_zoom_out), true);
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return true;
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}
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}
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@Override
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public boolean onOptionsItemSelected(MenuItem item) {
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switch (item.getItemId()) {
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case R.id.action_previous:
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if (mPage > 1) {
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mPage--;
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renderPage(false);
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showPageNumber();
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}
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return true;
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case R.id.action_next:
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if (mPage < mNumPages) {
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mPage++;
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renderPage(false);
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showPageNumber();
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}
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return true;
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case R.id.action_open:
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openDocument();
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return super.onOptionsItemSelected(item);
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case R.id.action_zoom_out:
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if (mZoomLevel > 0) {
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mZoomLevel--;
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renderPage(true);
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invalidateOptionsMenu();
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}
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return true;
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case R.id.action_zoom_in:
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if (mZoomLevel < MAX_ZOOM_LEVEL) {
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mZoomLevel++;
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renderPage(true);
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invalidateOptionsMenu();
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}
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return true;
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case R.id.action_view_document_properties:
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DocumentPropertiesFragment
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.getInstance((ArrayList<CharSequence>) mDocumentProperties)
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.show(getSupportFragmentManager(), DocumentPropertiesFragment.TAG);
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return true;
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case R.id.action_jump_to_page:
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new JumpToPageFragment()
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.show(getSupportFragmentManager(), JumpToPageFragment.TAG);
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return true;
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default:
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return super.onOptionsItemSelected(item);
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}
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}
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}
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